BESSELI
Returns the modified Bessel function of the first kind[1] of a number. In(x).
Syntax:
BESSELI(
x:Number,
n:Number )
Revisions:
This function was added in Fireworkz 2.00.
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Weisstein, Eric W.
"Modified Bessel Function of the First Kind."
From MathWorld--A Wolfram Web Resource.
https://mathworld.wolfram.com/ModifiedBesselFunctionoftheFirstKind.html